Why do we need a cycle of substances in an ecosystem?

The cycle is the basis of life on Earth. If it were not for him, then the reserves of substances would quickly run out and life would cease. Thanks to living organisms, the transformation of substances goes on endlessly in a vicious circle.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.